Blank for a glued cardboard box



BLANK FOR A GLUED CARDBOARD BOX Filed Jan so, 1967 Sheet of 2 1N VENTOR.

Kai Rune Pcnsson July 8, 1969 I 4 I K. R. PERSSON 3,454,209

BLANK FOR A GLUED CARDBOARD BOX Filed Jan. 30,1967 Sheet 2 of 2INVENTOR. KCLR Rune Peasson United States Patent Olfice 3,454,209Patented July 8, 1969 US. Cl. 22933 6 Claims ABSTRACT OF THE DISCLOSUREA blank for a glued rectangular cardboard box having two opposite longside walls. The short side walls have end tabs. Near the end edges ofthe long side walls there are provided stripes of adhesive, said stripesbeing aligned with each other on either side of the blank and parallelto the fold lines between the bottom of the box and the short sidewalls, so that the end tabs of the short side walls may be glued to theinsides of the long side walls. A cover is articulated to one of saidlong side walls. The cover has a longitudinal wing flap having adhesivestrips along at least two of its edges.

This invention relates to a blank for a glued cardboard box. The blankis subdivided in a manner known per se by fold lines into panelscorresponding to the bottom, the short walls and the long walls of theerected box. If the box is provided with a cover, this cover isarticulated at one of its longitudinal edges to one of the long walls ofthe box. The other longitudinal edge of the cover has an extension inthe form of a longitudinal wing flap adapted to be placed upon theoutside of the other long wall of the erected box.

The object of the invention is to simplify the application of adhesiveprior to the erection of the box and to devise the shape of the blankand the application of adhesive such as to obtain a sealed box. Thisobject is attained by a blank which in accordance with the invention hasthe features indicated in the annexed claims. Due'to the fact that theadhesive stripes are aligned with each other it is possible to ensure ahigh production capacity because the blanks can be advanced withoutinterruption below adhesive-applying rollers of conventional types.Adhesive may be applied either immediately before erection of the box orimmediately following up the punching of the blanks. In the latter caseuse is made of a drying thermoplastic adhesive which permits storing ofthe blanks and is heated immediately before the box is erected.Depending on the desired types of the erected box the blank can beformed in different manners within the scope of the invention, whichwill appear from the following description of three embodiments of theinvention exemplified in the annexed drawings.

FIG. 1 illustrates a blank according to the invention, FIG. 2 a partlyerected box made from the blank shown in FIG. 1, FIG. 3 is amodification of the blank shown in FIG. 1, FIG. 4 the blank according toFIG. 3 during erection of one short wall of the box, FIG. 4a a detail ofone corner of the box, FIG. 5 a further modification of the blank shownin FIG. 1, FIG. 6 a perspective view of one end of the blank the otherend of which is partly erected, FIG. 7 illustrates on an enlarged scalehow a corner panel is prebent inwardly so as to facilitate inwardturning thereof, FIG. 8 is a perspective view of one end of the almostfinally erected box made from the blank shown in FIG. 5 with certainparts broken away to expose essential details, and FIG. 9 illustratesthe erected box made from the blank shown in FIG. 5 and having one endopen for filling whereas the other end is shown in a partly closedposit-ion after filling.

The blank illustrated in FIG. 1 is by means of fold lines 1, 2, 3, 4, 5,6, 7, 8, 9, 10, 11 subdivided into rectangular panels which are to formthe bottom 12, the short walls 13, 14, the long walls 15, 16 and thecover or lid 17 of the erected box. At its outer longitudinal edge thecover has an extension in the form of a longitudinal wing flap 18, andat its short sides the cover has extensions in the form of transversewing flaps 19, 20.

The short walls have extensions at their end edges in the form of endfiaps 21. The transverse wing flaps 19, 20 of the cover have extensionsat one end each in the form of end flaps 22. I

For gluing the erected box the long walls 15, 16 and the longitudinalwing flap 18 of the cover are provided with adhesive stripes 23, 24, 25,26, 27, 28, preferably of a thermoplastic adhesive. The adhesive stripesextend along two parallel lines located near the end edges of the longwalls 15, 16 and the wing flap 18. On erection of the box the end flaps21 of the short walls are glued to the adhesive stripes 23, 24, 27, 26,and the end flaps 22 of the cover are glued to the adhesive stripes 25,28 on the wing flap 18, as is shown in FIG. 2. In certain cases thecover 17 shown in FIGS. 1 and 2 may be omitted.

FIG. 3 illustrates a modification of the blank shown in FIG. 1 and issuited for a more tight box. This blank differs from the blank shown inFIG. 1 in that the end tabs 21a of the short walls 13a, 14a arearticulated at 29 to the adjacent long walls 15a, 16a and that a 45 foldline 30 extends from each corner of the bottom 12:: obliquely througheach end flap. Consequently, the lower end portions of the end tabs ofthe short walls will be doubled up about the fold line 30 duringerection of the box so as to effect an absolutely tight corner at eachof the corners of the bottom, the perfectly sealed zone extendingupwards from the bottom to a height h (FIG. 4a) which is equal to thewidth of the end tabs 21a, as will be seen from FIG. 4. The adhesivestripes are indicated at 23a, 24a, 25a, 26a, 27a, 28a.

In the same way as at the end tabs of the short walls the wing flaps19a, 20a of the cover 1711 in FIG. 3 have extensions at one of theirends in the form of end tabs 2211 which are articulated to thelongitudinal wing flap 18a of the cover. These end tabs 22a, too haveeach a 45 fold line 31 which extends from the respective corner of thecover 17a and results in that the end tabs 22a of the wing flaps can bedoubled inwards through about half of their lengths in the present case.Even these corners of the cover provide for an increased tightness.

FIG. 5 illustrates a further embodiment of the blank according to theinventionwhich blank similar to the previously described blanks is bymeans of fold lines subdivided into rectangular panels corresponding tothe bottom 120, short walls 13c, 14c, long walls 15c, 16c and cover 17cof the erected box. At one longitudinal edge the cover is articulated toone long wall 150, and at the other longitudinal edge the cover has anextension in the form of a Wing flap 18c. Similar to FIG. 3, the shortwalls have extensions in the form of end tabs 21c which at their innerends are articulated to the adjacent long walls. Similar to FIG. 3,these end tabs are adapted to be doubled inwards due to the fact that a45 fold line 30c extends from each of the corners of the bottom.

As to the tray-forming lower portion of the box the embodiment shown inFIG. 5 is distinguished from the embodiment shown in FIG. 3 in that theshort walls 13c, 14c have extensions at their upper edges in the form ofwing flaps 32. Between adjacent ends of the end tabs 21c and the wingflaps 32 there is provided a small triangular 3 panel 33 the free edgeof which is aligned with the oblique corner of the wing flap 32.

In the embodiment illustrated in FIG. 5 the cover 17 has no transverseshort walls.

Applied to the blank shown in FIG. 5 are adhesive stripes 34, 35, 36, 37extending along parallel lines which are located at opposite edges ofthe blank near the end edges of the long walls 150, 16c and the cover17. The adhesive stripes 35, 37 on the long wall 150 are elongated andextend along the edges of the cover and the wing flap thereof and joinan adhesive stripe 38 located near the free edge of the wing flap 180.

During erection of the blank for forming a box or in connection with themanufacture of the blank the small triangular panels 33 are prebent, asshown in FIG. 7, in order to facilitate inward doubling of these panelsduring erection of the box according to FIGS. 6, 8 and 9.

As will be seen from FIGS. 8 and 9, the inwardly doubled triangularportion 33 at the respective corner of the erected box extends inwardlyso far that the adhesive stripes 35, 37 on the cover will be placed uponpart of the edges of the respective doubled triangular portion 33.

The box is erected in two steps. First, the short walls are erected andthe cover is glued to the wing flaps 32 of the short walls 13c, 14cwhereupon the box is placed on the long wall 150, and the other longwall 160 and the wing flap 180 of the cover are erected so that the boxis open for filling. After filling the end tabs 210 are turned inwardsand at the same time the long wall 160 is turned downwards and glued tothe inwardly turned end tabs 21c. In the next step the wing flap 180 ofthe cover is turned downward and glued to the upper side of the longwall 160 by means of the long adhesive stripe 38 at the edge of the flapof the cover and by means of the short remaining lengths of the adhesivestripes 35, 37 at the ends of the wing flap 180 of the cover.

Due to the above described design of the blank and arrangement of theadhesive stripes an effectively sealed package is obtained.

What I claim is:

1. A blank for a glued cardboard box, which blank is subdivided by foldlines into rectangular panels corresponding to the bottom, the shortwalls and the long walls of the erected box, said short walls havingextensions at their ends in the form of end tabs, and the two long wallsare provided with adhesive stripes positioned near the end edges thereofon either side of the blank and aligned with each other and parallel tothe fold lines between the bottom and the short walls whereby said endtabs of the short walls may be adhered to the insides of the long walls,said blank containing a cover having a longitudinal edge articulated toone of the long walls of the box and another longitudinal edge having anextension in the form of wing flaps adapted to be placed outside theshort walls of the erected box, each of the said transverse wing flapsof the cover having an extension at its end near the longitudinal wingflap of the cover in the form of an end tab, the longitudinal wing flapof the cover being provided with adhesive stripes positioned near theend edges thereof and aligned with the adhesive stripes on the longwalls of the box whereby the end tabs of the transverse wing 4 flaps maybe adhered to the inside of the longitudinal wing flap of the cover.

2. A blank for a glued cardboard box, which blank is subdivided by foldlines into rectangular panels corresponding to the bottom, the shortwalls and the long walls of-the erected box, said short walls havingextensions at their ends in the form of end tabs, and the two long wallsare provided with adhesive stripes positioned near the end edges thereofon either side of the blank and aligned with each other and parallel tothe fold lines between the bottom and the short walls whereby said endtabs of the short walls may be adhered to the insides of the long Walls,said blank containing a cover having a longitudinal edge articulated toone of the long walls of the box and another longitudinal edge having anextension in the form of a longitudinal wing flap to be placed upon theoutside of the other long wall of the erected box, said cover having anadhesive stripe near the end of each of said transverse edges andpositioned as an extension of the respective adhesive stripe on the longwall connecting said cover and said bottom, and said longitudinal wingflap having adhesive stripes near each of its edges and positioned to bean extension of the adhesive stripes on said cover.

3. A blank as claimed in claim 1 wherein the end tabs of the transversewing flaps of the cover are articulated to the end edges of thelongitudial Wing flap of the cover and a 45 fold line extends from thecorners of the cover through the respective end tab.

4. A blank as claimed in claim 2 wherein the short walls have extensionsat their upper ends in the form of wing flaps and the end edges of saidwing flaps are connected to the end edges of the end tabs of the shortwalls by means of an intermediate panel adapted to be doubled inwardlyduring erection of the box so as to form a sealing fold between said endedges.

5. A blank as claimed in claim 4 wherein said intermediate panel isslightly prebent to facilitate doubling thereof during erection of thebox.

6. A blank as claimed in claims 1, 2, 3, or 4 wherein the inner ends ofthe end tabs of the short walls are articulated to the long walls, and a45 fold line extends from each corner of the bottom through therespective end tab so as to form a triangular sealing portion adapted tobe adhered to the respective adjacent adhesive stripe on the long wall.

References Cited UNITED STATES PATENTS 3,386,349 6/1968 Hale 93492,210,443 8/ 1940 Borgstein 2293 3 2,544,565 3/ 1951 Phillips 229333,257,065 6/1966 Bowman et a1 229-31 FOREIGN PATENTS 67,999 10/1957France.

DAVID M. BOCKENEK, Primary Examiner.

US. Cl. X.R. 229-31, 32

